Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c630e4bdcff73b5…

MALICIOUS

PDF

37.7 KB Created: 2020-06-11 23:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 131256a6a17aa0c067f5cc1e6b871b24 SHA-1: b926aa256489df72f604a87819e739f1a04b4681 SHA-256: 9c630e4bdcff73b52f859205a6ef46b6b13a53dec3679b6983a30372156d473b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, suggesting a link farm or similar SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body text is heavily corrupted, but the presence of multiple suspicious URLs points to a delivery mechanism focused on external redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://doxanarrative.com/uploads/1/3/1/1/131163909/131163909.html#site+to+download+books+pdf+free
    • http://scottpropertyinvestmentsllc.com/uploads/1/3/1/8/131856212/zowemukazamo-navukegobanavod-wejisoxugug.pdf
    • http://cotium.com/uploads/1/3/0/7/130739457/kasejanubipitet.pdf
    • http://nasinfundat.org/uploads/1/3/0/2/130270911/vukosime_pejus_jovemod_zikir.pdf
    • http://fairmountinvestments.com/uploads/1/3/0/8/130873914/2876834.pdf
    • http://type1cyborg.jacquelineclewis.com/uploads/1/3/0/5/130588527/66557e127.pdf
    • https://nipukob.files.wordpress.com/2020/06/50142533224.pdf
    • https://dukerula.files.wordpress.com/2020/06/88110015925.pdf
    • https://zejamiwi.files.wordpress.com/2020/06/bofozijuxe.pdf
    • https://wekujepomope.files.wordpress.com/2020/06/zepizufanobukidolakub.pdf
    • https://lotosam.files.wordpress.com/2020/06/67388670534.pdf
    • https://ribixapisina.files.wordpress.com/2020/06/zilafoganuzegaduvumewujuw.pdf
    • https://ruwagifume.files.wordpress.com/2020/06/4513173925.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006827.bin
385a27f892553a9691cc2cd8c7057bcf702aaeae5eb86439412e53082659996f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6827 10316 bytes

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